Assessing field vulnerability to phosphorus loss in Beijing agricultural areausing Revised Field Phosphorus Ranking Scheme
LI Qi , CHEN Li-ding , QI Xin , ZHANG Xin-yu , MA Yan , FU Bo-jie
DOI:
Received October 22, 2006,Revised February 22, 2007, Accepted , Available online
Volume 19,2007,Pages 977-985
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Guanting Reservoir, one of the drinking water supply sources of Beijing, su ers from water eutrophication. It is mainly supplied
by Guishui River. Thus, to investigate the reasons of phosphorus (P) loss and improve the P management strategies in Guishui River
watershed are important for the safety of drinking water in this region. In this study, a Revised Field P Ranking Scheme (PRS) was
developed to reflect the field vulnerability of P loss at the field scale based on the Field PRS. In this new scheme, six factors are included,
and each one was assigned a relative weight and a determination method. The a ecting factors were classified into transport factors
and source factors, and, the standards of environmental quality on surface water and soil erosion classification and degradation of the
China were used in this scheme. By the new scheme, thirty-four fields in the Guishui River were categorized as “low”, “medium” or
“high” potential for P loss into the runo . The results showed that the P loss risks of orchard and vegetable fields were higher than that
of corn and soybean fields. The source factors were the main factors to a ect P loss from the study area. In the study area, controlling P
input and improving P usage e ciency are critical to decrease P loss. Based on the results, it was suggested that more attention should
be paid on the fields of vegetable and orchard since they have extremely high usage rate of P and high soil test of P. Compared with
P surplus by field measurements, the Revised Field PRS was more suitable for reflecting the characteristics of fields, and had higher
potential capacity to identify critical source areas of P loss than PRS.
